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http://www.gnu.org/licenses/lgpl-3.0.txt
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007

Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.

0. Additional Definitions.

As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.

"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.

An "Application" is any work that makes use of an interface provided
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1. Exception to Section 3 of the GNU GPL.

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Library.

add_empty:
Whether to add a first empty value or not (false by default)
If the option is not a Boolean, the value will be used as the text value

multiple:
true if the select tag must allow multiple selections

expanded:
true to display an expanded widget
if expanded is false, then the widget will be a select
if expanded is true and multiple is false, then the widget will be a list of radio
if expanded is true and multiple is true, then the widget will be a list of checkbox

renderer_class:
The class to use instead of the default ones

renderer_options:
The options to pass to the renderer constructor

renderer:
A renderer widget (overrides the expanded and renderer_options options)
The choices option must be: new sfCallable($thisWidgetInstance, "getChoices"")

label_separator:
The separator to use between the input checkbox and the label

class:
The class to use for the main

<

ul> tag
- separator:
The separator to use between each input checkbox
- formatter:
A callable to call to format the checkbox choices
The formatter callable receives the widget and the array of inputs as arguments
- template:
The template to use when grouping option in groups (%group% %options%)